Southern California has been issued its first-ever tropical storm watch as “large and powerful” Hurricane Hilary takes aim at Mexico and the region over the next 48 hours.The National Hurricane Center says that the watch is unprecedented for the region and Hilary is expected to bring heavy rain and the risk of flash flooding from the Baja California peninsula all the way north to Nevada.As of Friday, the hurricane was located about 360 miles southwest of Cabo San Lucas, Mexico, with maximum sustained winds of 145 mph.CIRA